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Busway Data

This dialog box includes the following areas and tabs:

Figure 1: Busway Data Dialog Box

Connection Information

Option Description
ID Name Uniquely identifies the busway. This name can be up to 12 characters long. The names default to BWY-1, BWY-2, BWY-3... as you enter new busways on the one-line, but you can change those names to make them more descriptive if needed.
From Bus The bus from which the busway connects, which must already exist on the one-line. You must be careful that the From Bus has the same base kV as the busway’s To Bus. For your reference, the From Bus base kV is displayed next to the bus name.
To Bus The bus to which the busway connects, which must already exist on the one-line. You must be careful that the To Bus has the same base kV as the busway’s From Bus. For your reference, the To Bus base kV is displayed next to the bus name.
Show Entire Line This box is selected by default and causes the entire line to be displayed. By clearing the check box, the line is only shown as a short section at each end with labels indicating the bus to which the other end is attached.

Specifications

Option Description
Unit Select either U.S. or Metric.
Mfr Provides a list of busway manufacturers available in the device library.
Type Provides a list of busway types available in the device library.
Length The length of the busway in feet or meters.
Ampacity Busway rating in amperes. After you choose a manufacturer and type, the available ampacities are displayed here. If the desired manufacturer is missing from the list, you can select Generic in the Mfr field and (std) in the Type field to select from generic options.
Material The busway material (copper or aluminum).
Impedances
  Impedances are described in ohms/100 feet or ohms/100 meters. Zero sequence impedances are found from the positive sequence impedance using a Z0/Z1 multiplier from Reference1Let's Be More Specific About Equipment Grounding, R.H. Kaufmann, General Electric Co., GER 1974..
R1 Positive sequence resistance.
X1 Positive sequence reactance.
R0 Zero sequence resistance. If you enter this value as zero (0.0), the positive sequence impedance is used.
X0 Zero sequence reactance. If you enter this value as zero (0.0), the positive sequence impedance is used.
Calculate Fills in computed values for the impedances R1, X1, R0, and X0 fields. You can override these values by typing in different numbers. The calculations are based on the specific manufacturer’s data for the type of busway chosen with the Mfr, Type, Ampacity, and Material fields.

Harmonics

Use the Harmonics tab to indicate whether this equipment item is introducing harmonics into your power system.

Figure 2: Harmonics Tab

Option Description
Resistance Factor

EasyPower offers two methods for calculating RH:

  • Resistance varying with a power of the harmonic (R-EXP):

    • RH = RFund * H R-EXP

  • Resistance varying with a percent eddy current factor (%ECF):

    • RH = RFund * (1+ECF*H2)/(1+ECF)

EasyPower defaults all skin effect correction to R-EXP and a value of 0.5.

Typical Resistance Correction Factors
  R-EXP %ECF

Transformer

0.5-1.0

1.0-3.0

Utility

0.0-0.8

    -

Generator

0.3-0.6

    -

Line/Cable

0.5

    -

Reactor

0.5-1.0

0.8-3.0

Motor

0.2-0.4

    -
Fundamental Amps

Use to set the fundamental amps. The options are as follows:

  • Equipment Rating sets Fundm Amps to the equipment rating of the item described in the Specifications tab. 
  • User Specified activates the Fundm Amps field, enabling you to specify a value. 

To use fundamental current calculated by power flow, select Calculated from Power Flow in the Summation Fundamental Voltage area of the Harmonics Options > Control dialog box.

Imported Data

This tab is read-only and appears only if you have imported data from an SKM Data Format file. See Importing an SKM Format File for more information.

Comments

See Comments for information.

Hyperlinks

See Hyperlinks for information.

More Information

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EasyPower Version 9.7

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Help was last updated on 2/8/2016